Charles Ellicott Commentary 1 Samuel 26:8

"Then said Abishai to David, God hath delivered up thine enemy into thy hand this day: now therefore let me smite him, I pray thee, with the spear to the earth at one stroke, and I will not smite him the second time." — 1 Samuel 26:8 (ASV)

I will not smite him the second time. —The meaning of the savage words of Abishai is accurately given in Lange’s paraphrase, “I will pin him to the ground so thoroughly with one blow that it will not need another to kill him;” “et secundo non opus erit” as the Vulgate well renders it.